Wrist watches are simply a device that tells time and is attached to (or is worn upon) the user's wrist. Wrist watches provide the time of day, displaying the hour and minute, and usually the second. Most also provide the
current date, and often the day of the week as well. However, many watches also provide a great deal of information beyond
the basics of time and date. Some watches include alarms .Other elaborated and more expensive watches, both pocket and wrist
models, also incorporate striking mechanisms or Repeater functions, so that the wearer could learn the time by the sound emanating
from the watch. This announcement or striking feature is an essential characteristic of true clocks and distinguishes such watches
from ordinary timepieces. This feature is available on most digital watches.

A complicated watch has one or more functions beyond the basic function of displaying the time and the date;
such a functionality is called a "complication". Two popular complications are the chronograph complication, which is
the ability of the watch movement to function as a stopwatch, and the moonphase complication, which is a display of
the lunar phase. Other more expensive complications include, Tourbillion, Perpetual calendar, Minute repeater and Equation
of time. A truly complicated watch has many of these complications at once (see Calibre 89 from Patek Philippe for instance).
Among watch enthusiasts, complicated watches are especially collectible. Some watches include a second 12-hour display for
UTC (as Pontos Grand Guichet GMT).

Some specially designed and manufactured watches are officially certified as a chronometer. The similar-sounding terms chronograph and chronometer are often
confused, although they mean altogether different things. A chronograph is a type of complication, as explained above.
A chronometer watch is an all-mechanical watch or clock whose movement has been tested and certified to operate within a
certain standard of accuracy by the COSC (Contrôle Officiel Suisse des Chronomètres). The concepts are different but not
mutually exclusive; a watch can be a chronograph, a chronometer, both, or neither.